Mechanical Junior Engineer

Location: Lisbon

About the job:

The Mechanical Junior Engineer supports the design, coordination, and delivery of mechanical systems within our data center projects. Reporting to the Senior Mechanical Engineer, this role offers hands-on exposure to complex mechanical design, construction, and commissioning processes.

This function assists in developing and implementing reliable, efficient, and scalable mechanical solutions - learning directly from experienced professionals while contributing to Europe’s most advanced data center developments.

Key Responsibilities

Design & Engineering Support

• Assist in developing mechanical design concepts and reviewing consultant deliverables, including HVAC, ventilation, and fire detection and suppression systems.


• Support the preparation and evaluation of mechanical design documentation such as drawings, specifications, and calculations.


• Contributes to the development of technical standards, design templates, and best practices across projects, including developing control-system sequences of operation for mechanical systems.


• Assist in monitoring design development activities and documenting progress across construction management tasks.


• Support the development of analytical models for capacity planning, conceptual design validation, and HVAC control-strategy evaluation.


• Collaborate with consultants, contractors, and vendors to ensure mechanical designs meet performance, safety, and sustainability targets.

Project Delivery

• Support the Senior Mechanical Engineer in coordinating mechanical works throughout the design and construction phases, identifying issues, and providing technical guidance.


• Participate in design coordination meetings and assist in reviewing submittals, shop drawings, and equipment selections.


• Help track progress against schedules, budgets, and technical specifications.


• Support commissioning activities, including testing, validation, and documentation of mechanical systems.

Quality, Safety & Compliance

• Ensure designs and installations comply with Portuguese and European mechanical standards, building codes, and environmental regulations.


• Contribute to quality assurance processes and document control.


• Promote safety, energy efficiency, and reliability in all aspects of mechanical design and operation.

Cross-functional Collaboration

• Work closely with electrical, civil, and controls engineers to ensure integrated systemvdesign and coordination.


• Work with the Sales team to support fit-out planning and address technical queries.


• Support operational handovers and provide ongoing technical support to the Operations team.


• Assist in identifying opportunities for continuous improvement in design, cost, and performance.

Minimum Requirements:

• Bachelor’s degree or higher in Mechanical Engineering, with a focus on Energy and HVAC systems.


• 1–3 years of experience in design, construction, or maintenance of mechanical systems (internships included).


• Familiarity with HVAC, chilled water systems, and fire protection design principles.


• Exposure to data centers, industrial facilities, or mission-critical environments.


• Knowledge of energy efficiency standards, sustainability design, or LEED principles.


• Understanding of AutoCAD, Revit, or other mechanical design software.


• Strong proficiency in MS Excel, including VBA and macro-based data analysis.


• Exposure to building energy modelling, system simulation, pipe-network analysis, or CFD tools is a plus.


• Knowledge of programming, electronics, and IT systems is a plus.


• Eagerness to learn, grow, and work in a highly technical, fast-paced environment, taking ownership of tasks and exploring solutions proactively.


• Fluency in Portuguese and English (written and spoken).

Why You'll Love It Here:

• Impact: Lead world class operations at Europe’s largest and most sustainable data center.


• Collaboration: Work closely with cross-functional teams and contribute to business development.


• Flexibility: Empowered to lead with autonomy and creativity in a fast-paced, client-centric environment.


• Growth: Join a company committed to innovation, professional development, and service excellence.

About Us:

At Start Campus, we provide mission-critical data center services that power businesses globally. We're customer-centric, innovative, and always looking to push boundaries.
If you're passionate about building relationships, driving customer success, and thriving in a tech-driven world, we want to hear from you!
If you think you have what it takes for this position and are looking for a new professional challenge send your application.

If you think you have what it takes for this position and are looking for a new professional challenge send your application.